Telescopic Hybrid Fast Solver for 3D Elliptic Problems with Point Singularities. - Anna Paszynska; Konrad Jopek; Krzysztof Banas; Maciej Paszynski; Piotr Gurgul; Andrew Lenerth; Donald Nguyen; Keshav Pingali; Lisandro Dalcín; Victor M. Calo (ICCS, 2015)